Senior Backend Engineer

About US MobileUS Mobile is building the future of wireless communication. The goal: one unified network open to any person and any device, worldwide. Connection without walls.
We’re getting there by empowering customers. All three major networks on one phone and one plan, plus home internet from Starlink. No lock‑in. No commitments. Custom fit plans at every price point. 24/7 customer support with real people, empowered to help. We get real-time feedback from Reddit, surveys, and customer support informing product roadmaps and everything we do.
We’re building innovative systems that scale. A network agnostic tech stack. Agile, cross‑functional teams built on trust and mutual respect. This work isn’t for everyone. If you work fast, flexibly, and collaboratively — without compromising standards — we want to hear from you.
You will
Architect optimal solutions to our business problems
Deploy exciting new features
Help us scale to 10’s of millions of customers & connected devices
Build quality tools and frameworks to ensure a high‑quality product
Build systems to ensure continuous uptime
Responsibilities
Develop and maintain RESTful APIs using Java (Spring Boot or related web frameworks) or Python (Flask, Django)
Design and implement asynchronous service communication using RabbitMQ or AWS SQS/SNS
Work with NoSQL databases like MongoDB for data modeling and storage
Collaborate with Product, QA, and DevOps teams to deliver reliable and scalable features
Write clean, testable, and well‑documented code with unit and integration tests
Participate in system architecture design, code reviews, and performance tuning
Qualifications
7+ years of experience with Java and Spring Boot
Strong experience with building and consuming REST APIs
Hands‑on experience with message brokers such as RabbitMQ or AWS SQS/SNS
Familiarity with MongoDB or other NoSQL database technologies
Experience integrating and leveraging AI‑assisted development tools such as Claude and Opencode to accelerate backend development, including code generation, debugging, and optimization of APIs and services
Demonstrated ability to incorporate AI tools into the software development lifecycle, using Claude or Opencode for tasks like automated code reviews, documentation generation, and improving system design efficiency
Solid understanding of Git, CI/CD workflows, and agile development practices
Excellent debugging, problem‑solving, and communication skills
Strong communication and team collaboration skills
Benefits
Health care coverage
Flexible paid time off
Gym reimbursement
Free cell phone service
Your choice of equipment + Bose QC/Apple Airpod Pro headphones
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